"The variable weather of the mind, the flying vapours of incipient madness, which from time to time cloud reason, without eclipsing it, it requires so much nicety to exhibit, that Addison seems to have been deterred from prosecuting his own design."
— Johnson, Samuel (1709-1784)
Text from The Works of Samuel Johnson, new ed., vol. 7 of 12 (London: Rivington, 1823). <Link to Google Books>
See also Samuel Johnson, Prefaces, Biographical and Critical, to the Works of the English Poets, vol. 5 (London: Bathurst et al., 1779). <Link to ESTC><Link to ECCO>